David A. Clark, clinical psychologist, researcher, therapist and Professor Emeritus of Psychology at the University of New Brunswick, Canada received his formal training in behavior therapy and a PhD in 1984 at the Institute of Psychiatry, University of London, England. He then proceeded to postdoctoral research and clinical training under Dr. Aaron T. Beck at the Center for Cognitive Therapy, University of Pennsylvania. He has coauthored several books on cognitive behavior therapy of anxiety and depression with Dr. Beck, the founder of cognitive therapy, including Cognitive Therapy of Anxiety Disorders: Science and Practice (Guilford, 2012) and The Anxiety & Worry Workbook: The Cognitive Behavioral Solution (2e, Guilford, 2023). He is author of The Anxious Thoughts Workbook (2018, New Harbinger), The Negative Thoughts Workbook (New Harbinger, 2020), and more recently This is What Anxiety Looks Like (New Harbinger, 2024). He maintains a blog with Psychology Today called the Runaway Mind.
